A remake of an old-fashioned tallship could also be cool; I know a few that offer 'internships' of sorts. Basically; as a tourist you pay to sail along, and you can also become part of the crew and learn how to sail a ship like that.
That would allow for a more traditional type of deckhand as well.
Though the downside of that would be that a 'cruise' of that kind doesn't fit everyone, so a regular cruiseship makes it easier for other people to join in, I think